Which port and protocol is used for POP3 mail retrieval?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

Which port and protocol is used for POP3 mail retrieval?

Explanation:
POP3 is the protocol used by email clients to retrieve messages from a mail server. By default, it uses TCP port 110 for unencrypted connections. If SSL/TLS is used, the service runs on port 995 (POP3S). The other options correspond to different services: port 25 is for SMTP (sending mail), port 143 is IMAP (another retrieval protocol), and port 993 is IMAP over SSL (IMAPS). Therefore, for POP3 mail retrieval, the standard port and protocol are 110 TCP.

POP3 is the protocol used by email clients to retrieve messages from a mail server. By default, it uses TCP port 110 for unencrypted connections. If SSL/TLS is used, the service runs on port 995 (POP3S). The other options correspond to different services: port 25 is for SMTP (sending mail), port 143 is IMAP (another retrieval protocol), and port 993 is IMAP over SSL (IMAPS). Therefore, for POP3 mail retrieval, the standard port and protocol are 110 TCP.

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